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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fa3adbd48011c14774e987ac07d9ee896fa43ceb58281a7d568f414b1af69a2' 
  AND token = 'mnfxJEtIsdroC2Nc9RUErgLdlHG4P27w2odnmYMW2Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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