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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1d614977ac0cefb414b19b55f149463bc4dc9e01f99f0d05eac7475dbc1d1a9' 
  AND token = 'ddr0oKyKz/rqac25Tm6B+oKIf8O2MhmJoxAG2VElEGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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