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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eca947abbf30821cd71af295e33af55f6da635e72c8a7e0dc88b9088fb56b535' 
  AND token = 'MdDv5EIxufy6dZ3TtVujSNEFjwntoZTogF8m1vs0Y/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}