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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65a7648041eecfe503dc9e63d689f2997f6a0ffcc060bdc067afaf0e9c0affba' 
  AND token = 'hR9y9ogcrsunCG4irwQ1mE3op7D/Kn0ofrE/qwoZuds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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