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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c0fa7abdebbe03443ac8a884a5506ed2ccfad7e2a652447d97d145b246b385a' 
  AND token = 'rfQ3NquLj03HOvrQnQMY6ef1sWJ1T77HadYUQrldSzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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